Why are regular visits to the doctor important for maintaining your optimal immune health?
a) to be sure that your overall health is good and to receive the necessary vaccinations
b) to identify any problems with your immune system early and to increase the stress you are under
c) to avoid making contact with sick people and evaluate your weight
d) to check on the status of your growth and maintain your weight

A) to be sure that your overall health is good and to receive the necessary vaccinations

Explanation:

The immune system plays a very important role by fighting the infections in the body and thus, keeping it in a disease-free and healthy state.To maintain optimal immune health it is necessary that one should visit the doctor regularly to know if the overall health is good or not, and if there are any issues then one should follow a healthy lifestyle and other advice given by the doctor to maintain a healthy immune system.Further, the immune system is boosted by the vaccinations and one should visit the doctor regularly to get vaccinated at appropriate times by following the vaccination schedule.